US5755259A - Safety shut-off for gas lines - Google Patents

Safety shut-off for gas lines Download PDF

Info

Publication number
US5755259A
US5755259A US08/687,153 US68715396A US5755259A US 5755259 A US5755259 A US 5755259A US 68715396 A US68715396 A US 68715396A US 5755259 A US5755259 A US 5755259A
Authority
US
United States
Prior art keywords
valve
sealing device
valve body
spring
safety sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/687,153
Inventor
Klaus Schulze
Gunter Albrecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mertik Maxitrol GmbH and Co KG
Original Assignee
Mertik Maxitrol GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE4300432.6 priority Critical
Priority to DE19934300432 priority patent/DE4300432A1/en
Priority to DE9319910U priority patent/DE9319910U1/en
Priority to DE9319910U priority
Priority to DE19934344575 priority patent/DE4344575A1/en
Priority to DE4344575.6 priority
Priority to US30367294A priority
Application filed by Mertik Maxitrol GmbH and Co KG filed Critical Mertik Maxitrol GmbH and Co KG
Priority to US08/687,153 priority patent/US5755259A/en
Application granted granted Critical
Publication of US5755259A publication Critical patent/US5755259A/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02Welded joints; Adhesive joints
    • F16L47/03Welded joints with an electrical resistance incorporated in the joint
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20Excess-flow valves
    • F16K17/22Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/30Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7723Safety cut-off requiring reset
    • Y10T137/7726Responsive to change in rate of flow
    • Y10T137/7727Excessive flow cut-off
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7869Biased open
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7904Reciprocating valves
    • Y10T137/7922Spring biased
    • Y10T137/7929Spring coaxial with valve
    • Y10T137/7936Spring guides valve head
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/8593Systems
    • Y10T137/87917Flow path with serial valves and/or closures
    • Y10T137/88046Biased valve with external operator

Abstract

The invention takes as its basis the problem of creating a safety sealing device for gas pipes by which the bearing of the valve body should be frictionless, require no maintenance and which causes only minimal flow resistance. Further the safety sealing device should not require outward sealing connections. It should be easy to install and able to be fitted into existing gas piping or fittings without having to change them.
The problem is solved in that with safety sealing devices with a valve body (6) which can be pressed against a valve seat (1), whereby the valve body (6) is supported so that it is movable in the axial direction of the valve seat (1) is against the force of a locking spring (8), the valve body is conducted only through a spring and is otherwise freely movable without additional support points.
The invention concerns a safety sealing device for closing gas conduits in cases of damage, e.g. pipe bursts or hose ruptures, in order to prevent an uncontrolled leakage of gas and thereby a dangerous situation.

Description

This is a division of U.S. Pat. application Ser. No. 08/303,672, now abandoned filed Sep. 9, 1994 which is a continuation application of PCT/EP93/03686, filed Dec. 24, 1993.

BACKGROUND AND SUMMARY OF THE INVENTION

The invention concerns a safety sealing device for gas conduits with a valve body and a valve seat according to the introductory part of the first patent claim.

These type of safety sealing devices serve, in cases of damage such as pipe bursts or hose ruptures, to seal the gas conduit in order to prevent an uncontrolled leakage of gas and thereby a dangerous situation.

Safety sealing devices for gas conduits have already been known, which are arranged between the supply pipe and a using device and which should ensure that, for example with pipe bursts or hose ruptures, sealing of the supply pipe is achieved.

Thus a safety sealing device is described in WO 92/01184, which seals a piping system should it be damaged without however effecting a premature closure of the supply line should a using device need the amount of gas corresponding to its output over a longer period of time. With this safety sealing device, a valve is supported against the force of a spring such that it can slide in the axial direction of a tubular shaped housing of a slidable plate valve. To achieve this, discs with axial support positions for the plate valve are placed in the housing, the discs having penetrations for gas flow around their circumferences. The housing has threads at both facing ends for connection to the piping or other fittings.

With this solution it is disadvantageous that the movement of the valve head is conducted through supports. Because the available standing pressure forces, which then in cases of damage act on the valve head for the closure movement, is only a few millibars, the spring's force, which determines the flow rate at which the safety sealing device should operate, is extraordinary small. Thus support friction can substantially change this flow rate and hence the results are not reliably reproducible.

This disadvantage is especially serious when it is considered that the valve is not activated under normal operation and therefore no movement of the valve shaft ensues within the bearing, which is exposed to contamination due to the gas flow. The use of such safety sealing devices is, amongst other things, intended however with gas pipes that are laid underground which means that they also have to retain their safety capabilities without maintenance over a longer period of time e.g. several decades.

It is a further disadvantage that with the installation of the valve in a gas pipe two new outward sealing points are made and that when combining the safety device with another fitting, e.g. a hose cock, its constructional length is increased. When extending existing systems, it is necessary to shorten the existing gas supply line correspondingly.

The penetrated discs which serve to bear the plate valve further create an additional pressure loss. Seen as a whole, this thereby results in a rather complex device due to the connection threads and the components.

The invention takes as its basis the problem of creating a safety sealing device for gas pipes by which the bearing of the valve body should be substantially frictionless, require no maintenance and which causes only minimal flow resistance. Further the safety sealing device should not require outward sealing connections. It should be easy to install and able to be fitted into existing gas piping or fittings without having to make modifications thereto.

According to the invention, the problem is solved in that the valve body is conducted only through a spring and is otherwise freely movable without additional support points. Thus the disadvantages associated with such support points and associated frictional forces discussed above are voided.

Advantageous refinements of the invention are taken from the further patent claims given later. Because the safety sealing device has one or more sealing rings at its circumference, which simultaneously serve for attachment and internal sealing, whereby they are pushed into a gas pipe or the inlets or outlets of a gas fitting, whereby the diameter of the sealing rings is larger than the inner diameter of the gas pipe or the inlets or outlets of a gas fitting, it is possible to incorporate the present invention in such supply systems without additional outward sealing connections while at the same time the present invention is capable of easy installation. Preferably thereby, the sealing rings are made in one piece with the tubular shaped valve seat of the ring flanges connected to the safety sealing device.

The outer diameter of the valve body without the elastic sealing element is smaller than inner diameter of the valve seat associated with it, whilst the outer diameter of the valve body with the sealing element is larger than this inner diameter. Also a circular shoulder is formed in the inner diameter of the valve seat at a tubular end-piece in the flow direction thereof. The length of the tubular end piece is so dimensioned that a blocking element, with a sealing element in place, does not leave this tubular shaped end-piece in the closure direction of the safety sealing device, whereas with a missing sealing element, the valve body can be pressed so far into the valve seat that the blocking element protrudes out of the end-piece. Thus, the installation can be carried out very easily, in which the valve body together with the locking spring, the sealing element not being fitted, is placed so far into the valve seat, that the blocking element can readily be connected to a lug belonging to the valve boy in the flow direction. In conclusion, the installation of the sealing element is carried out.

It is an advantage that the lug is provided with a thread on which that for example, a wire clip as blocking element is easily attached and is adjustable in the axial direction of the lug for adjustment purposes.

Of course it also possible that the valve body is screwed on to the lug thread in the flow direction whilst the blocking element, resting on the shoulder of the valve seat, is rigidly attached to the lug thread.

It is shown that it is especially satisfactory if the valve body is suspended plate, which is spring biased so as to rest in the open position on a circlip elastically deformable in the radial direction. The circlip is itself latched into a notch, which is preferably formed in one piece with the valve seat. Thereby the circlip can be formed for example by, an expanding spring or a split annular ring which preferably has three radially inwardly extending flanges distributed evenly around the circumference whereby the flow cross-section is reduced immaterially. Due to the extremely low weight, this model has the advantage that the occurring mass reaction, depending on the installation location which for example has influence on the deflection and balance of forces and therefore also on the closure process, is lower.

That thereby to enable adjustment without changing the flow cross-section, it is a proven advantage if the support shoulder of the spring end facing the valve body is adjustable in the axial direction in that it is connected, for example, to the valve seat by a thread. Due to this adjustable support shoulder, a possibility for adjusting the safety sealing device has been found which suffices without changing the flow cross-section.

In order to achieve a very high sealing efficiency also without additional elastic sealing elements, the valve body and the valve seat should constructed such that either the valve body is spherical in the area of the sealing surface or the opposite valve seat is shaped as a concave sphere in the area of the sealing surface.

For safety sealing devices which are found only in gas pipe lines which are very difficult to access, e.g. in underground gas pipes, it is a proven advantage if the valve body has a leakage bore because it can re-open after repair of the damage which lead to the closure of the safety sealing device.

Especially for use in connection with a commercial gas stopcock, it is an advantage if the safety sealing device is inserted in the gas inlet of the gas stopcock, whereby the plate of the safety sealing device has a lug-shaped extension on its side facing the spring in the axial direction, which protrudes from the same when the safety sealing device is closed whereas it is within the same when the safety sealing device is open. It is of course also possible that the valve seat made in one piece with the gas inlet of the gas stopcock. Thereby the safety sealing device is located so far inside the gas inlet that the lug-shaped extension protrudes into the swivel area of the closure member of the gas stopcock. With this solution the safety sealing device can close completely sealed. A leakage flow bore for automatic re-opening of the gas stopcock is not necessary. With the closing of the gas stopcock, which is normally the case in damage repair, e.g replacing a hose, the lug-shaped extension is pushed in the axial direction whereby the safety sealing device is re-opened so that the gas can flow again after damage repair and on opening the gas stopcock.

For polyethylene gas pipes, connections are made in many cases with so called electro-welded sleeves. For the special use of the safety sealing device in connection with electro-welded sleeves, the safety sealing device is constructed such that the outer diameter of the tubular shaped valve seat is the same as the outer diameter of the gas pipe, whereby a sealing ring, if it is to be used, is dimensioned self-evidently such that its diameter is larger than the outer diameter of the gas pipe. It is obvious that the valve seat can be connected with the electro-welded sleeve in one piece.

Due to the enlargement of the outer diameter of the valve seat or the single piece construction, it is also possible to enlarge the inner diameter of the safety sealing device through which pressure loss caused by the safety sealing device can be minimized.

In order to keep the constructional increase in length small, which is necessary in order to guarantee the double-ended welding length used for connection with the gas pipe, it is an advantage if the safety sealing device has a collar at its outflow end whereby the outer diameter of the collar is smaller than the inner diameter of the gas pipe.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a section view showing a safety sealing device for gas pipes according to the invention in the open position;

FIG. 2 is a section view showing a safety sealing device for gas pipes according to the invention in the closed position;

FIG. 3 is a section view showing a safety sealing device for gas pipes according to the invention during assembly and before installation of the elastic sealing element;

FIG. 4 is a section view of another embodiment of a safety sealing device for gas pipes according to the invention;

FIG. 5 is a plan view of the safety sealing device according to the invention shown in FIG. 4 as seen looking in the direction of arrow A;

FIG. 6 shows a further version of a safety sealing device for gas pipes according to the invention in the open position;

FIG. 7 shows in section a safety sealing device for gas pipes according to the invention in a further version with a freely suspended valve body (6), in the open position;

FIG. 8 is a plan view of the safety sealing device according to the invention of FIG. 7 as seen looking in the direction of arrow B;

FIG. 9 is a plan view of the safety sealing device according to the invention from FIG. 7 with a different circlip for the spring;

FIG. 10 shows in section an adjustable safety sealing device for gas pipes according to the invention in a further version, in the open position;

FIG. 11 shows a safety sealing device for gas pipes according to the invention in the gas inlet of a gas stopcock, in the closed position;

FIG. 12 shows a safety sealing device for gas pipes according to the invention in the gas inlet of a gas stopcock, in the open position;

FIG. 13 shows a safety sealing device for gas pipes according to the invention used in an electro-welded sleeve, in the open position;

FIG. 14 shows a safety sealing device for gas pipes according to the invention integrated with an electro-welded sleeve, in the closed position; and

FIG. 15 shows a circlip for application in an electro-welded sleeve.

The safety sealing device for gas pipes, according to the invention, shown in FIG. 1 consists of a tubular shaped valve seat (1), which has at its outer diameter, which is otherwise smaller than the inner diameter gas pipe (26) (not shown in FIG. 1, but shown in different figures) with which the safety sealing device is to be used, a ring flange (2) whose diameter is on the other hand larger than the inner diameter of gas pipe (26). In order to guarantee an easy insertion of the safety sealing device, according to the invention, the ring flange (2) is advantageously provided with an insertion bevel (3). Further it is a proven advantage if the ring flange (2) is provided with a circular groove (4) on both sides in order to achieve a better elasticity by means of the enlarged height of the ring flange (2). Ring flange (2) is intended to form a friction fit sealing relationship with the inside diameter of the gas pipe to which it is fitted and may be slightly deformed during installation.

At its rear face, against the flow direction shown by an arrow, a sealing surface (5) is located in the form of a concave ball. A valve body (6), movable in the axial direction, is arranged within the valve seat (1) and has a ring shaped notch for the accommodation of a circular ring (7) serving as a sealing element. Thereby the valve body (6) and circular ring (7) dimensions are determined such that the outer diameter of valve body (6) without circular ring (7) is smaller than the inner diameter of its associated valve seat (1) whilst the outer diameter of the valve body (6) with mounted circular ring (7) is larger than this inner diameter.

On the flow direction side of valve body (6), one of the valve bodies (6) is held supported in the open position by spring (8) preferably formed as a compression spring, which is supported at its other end by circular shoulder (9) which is integrally formed with and connects to valve body (6) within its associated inner circumference of valve seat (1).

For guiding spring (8), the valve body (6) has a circular collar (10) on which a lug (11) is connected in the flow direction. Lug (11) has a through-hole (12) at its end which serves to accommodate a blocking element (13), in this case a rod (FIG. 1). There is the relationship between the length of lug (11) and the length of the tubular shaped end-piece (14) connected on shoulder (9), that the blocking element (13) with mounted circular ring (7) does not leave this tubular shaped end-piece (14) in the closed position of safety sealing device (FIG. 2) whereas without circular ring (7), the valve body (6) can be pressed so far into the valve seat (1) that the blocking element (13) protrudes out of the end piece (14) (FIG. 3).

A somewhat different version is shown in FIG. 4. Hereby lug (11) is provided with a thread at its downstream end and a wire clip (15), which is formed such that it can be screwed on to lug (11) (FIG. 5) and serves as blocking element (13).

In FIG. 6 a further version is shown. This solution differs from the previous version in that the valve body (6) and the lug (11) consist of two separate components whereby the valve body (6) has an axial threaded bore (16) with which it is screwed on to the threaded lug (11) located in the flow direction upon which the supported blocking element (13) is rigidly attached to shoulder (9) of valve seat (1). In order to guarantee the necessary sealing and prevent twisting, an appropriate material, e.g. in this case a commercial PTFE (polytetraflorethylene) tape (17) is located between lug (11) and the bore (16). In this version, an elastic sealing element is dispensed with. To achieve the desired sealing efficiency, valve body (6) is spherically shaped whilst the sealing surface (5) is executed as a bevel. To accommodate spring (8) and at the same time to reduce mass, valve body (6) has additionally a recess (27).

In a further safety sealing device, according to the invention shown in FIG. 7, the ring flange (2) found at the end of valve seat (1) is made significantly stronger than in the form of construction described above, whereby it also has an insertion bevel (3). This type of valve seat (1) is especially suitable for the installation in gas pipes consisting of polyethylene as they are shown allusively under (26) in FIG. 7. The safety sealing device is hereby installed in which the gas pipe (26), e.g. consisting of polyethylene pipe, is heated. The yielding component is in this case not the ring flange (2) but the gas pipe (26).

The valve body consists of a freely suspended plate (18) on spring (8) which in the open position rests against an elastic radially deformable circlip. In this form of construction, the circlip consists of, as can easily be recognized in FIG. 8, an expanding spring (20) which is latched into a circular inner notch (19) of the valve seat (1).

Instead of the expanding spring (20), other shaped circlips can also be used. For example in FIG. 9, the circlip is formed by a split circular ring (24) which has preferably three radially inwardly extending flanges (25) arranged regularly around the circumference. Thereby it is to be observed that the surface area of the circlip which may reduce the flow cross-section is to be kept as low as possible.

A circular ring (7) located on plate (18) serves to achieve the desired sealing efficiency, whilst the sealing surface (5) of valve seat (1) is on the other hand constructed in the form of a concave ball.

Because gas piping of polyethylene tubing is generally underground and that the safety sealing device can only be reached with difficulty, the plate (18) has a leakage bore (23), which leads to a definitive and self-evident permissible leakage flow, whereby after repair of damage which caused the safety sealing device to close, the device re-opens itself.

In FIG. 10, the safety sealing device already described in FIG. 7 is changed to the effect that the circlip shoulder (21), constructed as a separate component, is connected to valve seat (1) via a thread (22) and is thereby adjustable in the axial direction. This axial adjustment enables the spring force biasing the valve 18 into an open position to be varied thereby enabling control of the flow rate at which the valve is moved into a closed position. Thus an adjustment is made possible which dispenses with the need to change the flow cross-section.

The use of the safety sealing device, according to the invention, in connection with a commercial gas stopcock (29) is shown in FIGS. 11 and 12. Whilst in FIG. 11, the safety sealing device is inserted in the gas inlet of the gas stop cock, in FIG. 12 the valve seat (1) is constructed in one-piece with the gas inlet of the gas stopcock (29). In both constructions, plate (8) of the safety sealing device has a lug-shaped extension (28) on its side facing spring (8) in the axial direction, which protrudes from the safety sealing device when it is closed (FIG. 11), whereas in the open position of the safety sealing device the lug (28) is within it. Thereby the safety sealing device is arranged so far in the gas inlet that the lug-formed extension (28) protrudes into swivel range of the closure member (32) of the gas stopcock (29) when the safety sealing device is closed. With the closing of the gas stopcock (29), which usually takes place when damage occurs, the lug-shaped extension (28), whose end is correspondingly shaped, is pushed in the axial direction (FIG. 12), whereby the safety sealing device completely re-opens again due to the effects of spring (8), so that after damage repair gas flow can take place again when the gas stopcock (29) is opened.

With gas pipes (26) consisting of polyethylene tubing, connections are made in many cases by means of so-called electro-welded sleeves (30). A safety sealing device advantageous for this case is shown in FIGS. 13 and 14. Whilst in FIG. 13, the safety sealing device is inserted in the electro-welded sleeve (30), in FIG. 14 the valve seat (1) is constructed in one-piece with the same. In order to realize the circlip (33) simply for the plate (8), the circular ring (24) which serves as a circlip shown in FIG. 9 has teeth (34), which press into the electro-welded sleeve, in addition to the flanges (25) distributed around the outer circumference.

As can be seen from both figures, the inner diameter of the safety sealing device can be enlarged, as they are located outside the gas pipe (26), whereby pressure reduction due to the safety sealing device can be minimized.

In order to keep the constructional increase in length, to accommodate the safety sealing device small while still guaranteeing sufficient welding length used for connection with the gas pipe (26), it is an advantage if the safety sealing device has a reduced diameter collar (31) at its outflow end, whose flow cross-section is otherwise larger than the flow cross-section in the plate area, whereby the outer diameter of the collar (31) is smaller than the inner diameter of the gas pipe (26).

It is obvious that the individual constructions described in this specification lay no claim on completeness. For example it is possible that the individual components given in the above construction can be interchanged without leaving the claimed area of protection.

Claims (12)

We claim:
1. A safety sealing device for gas pipes comprising a valve body (6), which can be pressed against a valve seat (1), whereby the valve body (6) which is guided only through a spring (8) and is otherwise freely movable without additional support points, and is movable in the axial direction of the valve seat (1) in the closure direction against the force of said spring (8), and the valve body (6) is a freely suspended plate (18) which is supported by a spring in the open position against a circlip which is elastically deformable in the radial direction and is latched into a notch (19) formed in the valve seat (1), characterized in that the plate (18) has a lug-shaped extension (28) on its side facing said spring (8) in the axial direction, which protrudes out of the safety sealing device in the closed position and which remains within the same in the open position, said lug shaped extension being accessible externally of said safety sealing device to enable resetting of said valve body to said open position.
2. A safety sealing device for gas pipes according to claim 1, characterized in that the valve seat (1) is integrally formed with the gas inlet of a gas stopcock (29).
3. A safety sealing device for gas pipes according to claim 1, further including a circlip shoulder for the end of the spring (8) facing the valve body (6), said circlip shoulder being threadedly connected to said valve seat and adjustable in the axial direction.
4. A safety sealing device for gas pipes according to claim 1, characterized in that the circlip is formed by a split circular ring (24) which has three radial flanges (25) extending inwards distributed evenly around its circumference.
5. A valve incorporating a safety sealing device for gas pipes comprising:
a housing;
a valve cavity within said housing;
an inlet passage within said housing for admitting fluid into said cavity;
a rotary valve member within said valve cavity, said rotary valve member having a fluid passage therethrough, said rotary valve member being movable between a first position in which said valve fluid passage is in fluid communication with said inlet passage and a second position in which said valve fluid passage is out of fluid communication with said inlet passage;
a valve seat provided within said inlet passage;
a valve body freely movably disposed within said inlet passage;
a biasing member within said inlet passage, said biasing member urging said valve body into an open position against a stop provided in said inlet passage;
said valve body being movable to a closed position in response to excessive fluid flow through said inlet passage and including a projection extending axially therefrom in the direction of movement of said valve body from said open position to said closed position, said extension being operative to reset said valve body to said open position in response to movement of said rotary valve member into said second position.
6. A safety sealing device for gas pipes according to claim 5 wherein said safety sealing device is positioned within said inlet.
7. A safety sealing device for gas pipes according to claim 6 wherein said fluid shut off valve is provided within said housing.
8. A safety sealing device for gas pipes according to claim 5 wherein said stop comprises a spring clip seated within said housing.
9. A safety sealing device for gas pipes according to claim 5 further comprising a spring seat within said housing, and said biasing member comprises a spring extending between said seat and said valve member.
10. A safety sealing device for gas pipes according to claim 9 wherein the distance between said spring seat and said valve body when said valve is in said open position is adjustable.
11. A safety sealing device for gas pipes comprising a valve body (6), which can be pressed against a valve seat (1), whereby the valve body (6) which is guided only through a spring (8) and is otherwise freely movable without additional support points, and is movable in the axial direction of the valve seat (1) in the closure direction against the force of said spring (8), a circlip shoulder threadedly connected to said valve seat, said circlip shoulder being adjustable in the axial direction, said valve body (6) being a freely suspended plate (18) which is supported by a spring in the open position against a circlip which is elastically deformable in the radial direction and is latched into a notch (19) formed in the valve seat (1), characterized in that the plate (18) has a lug-shaped extension (28) on its side facing said spring (8) in the axial direction, which protrudes out of the safety sealing device in the closed position and which remains within the same in the open position, said lug shaped extension being accessible externally of said safety sealing device to enable resetting of said valve body to said open position.
12. A safety sealing device for gas pipes comprising:
a housing;
a valve seat provided within said housing;
a valve body freely movably disposed within said housing;
a spring seat within said housing;
a spring within said housing extending between said spring seat and said valve body, said spring urging said valve body into an open position against a stop provided in said housing, the distance between said spring seat and said valve body when said valve is in an open position is adjustable;
said valve body being movable to a closed position in response to excessive fluid flow through said housing and including a projection extending axially therefrom in the direction of movement of said valve member from said open position to said closed position, said extension being operative to enable resetting of said valve member to said open position.
US08/687,153 1993-01-09 1996-07-24 Safety shut-off for gas lines Expired - Fee Related US5755259A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE4300432.6 1993-01-09
DE19934300432 DE4300432A1 (en) 1993-01-09 1993-01-09 Safety shut=off for gas pipes
DE9319910U 1993-12-24
DE19934344575 DE4344575A1 (en) 1993-01-09 1993-12-24 Safety closing device for gas conduits
DE4344575.6 1993-12-24
DE9319910U DE9319910U1 (en) 1993-12-24 1993-12-24 Electro socket
US30367294A true 1994-09-09 1994-09-09
US08/687,153 US5755259A (en) 1993-01-09 1996-07-24 Safety shut-off for gas lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/687,153 US5755259A (en) 1993-01-09 1996-07-24 Safety shut-off for gas lines

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US30367294A Division 1994-09-09 1994-09-09

Publications (1)

Publication Number Publication Date
US5755259A true US5755259A (en) 1998-05-26

Family

ID=27435676

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/687,153 Expired - Fee Related US5755259A (en) 1993-01-09 1996-07-24 Safety shut-off for gas lines

Country Status (2)

Country Link
US (1) US5755259A (en)
KR (1) KR960700427A (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10030609A1 (en) * 2000-06-21 2002-01-03 Mannesmann Vdo Ag Valve for a fuel delivery unit
US6408870B1 (en) 2001-08-31 2002-06-25 Research By Copperhead Hill, Inc. Flow control valve
EP1314921A2 (en) * 2001-11-23 2003-05-28 Voss Fluid GmbH + Co. KG Pipe-fracture valve
US20040074542A1 (en) * 2002-07-31 2004-04-22 Umac Inc. Excessive flow valve
US20040079911A1 (en) * 2002-10-28 2004-04-29 Glover Donald S. Excess flow valve with magnet
US20100012202A1 (en) * 2007-03-02 2010-01-21 Fischer Norbert Gas flow monitor
US20110023983A1 (en) * 2008-03-11 2011-02-03 Norbert Fischer Gas flow monitor
US8662101B2 (en) 2009-05-12 2014-03-04 Mertik Maxitrol Gmbh & Co. Kg Device for inserting a shut-off device in a pipeline
US8839815B2 (en) 2011-12-15 2014-09-23 Honeywell International Inc. Gas valve with electronic cycle counter
US8899264B2 (en) 2011-12-15 2014-12-02 Honeywell International Inc. Gas valve with electronic proof of closure system
US8905063B2 (en) 2011-12-15 2014-12-09 Honeywell International Inc. Gas valve with fuel rate monitor
US8947242B2 (en) 2011-12-15 2015-02-03 Honeywell International Inc. Gas valve with valve leakage test
US9074770B2 (en) 2011-12-15 2015-07-07 Honeywell International Inc. Gas valve with electronic valve proving system
US9234661B2 (en) 2012-09-15 2016-01-12 Honeywell International Inc. Burner control system
CN105526445A (en) * 2013-10-29 2016-04-27 南安市丽迪家居用品有限公司 Connector
US20160176285A1 (en) * 2013-08-05 2016-06-23 Eaton Corporation Fuel tank check valve
US20160357198A1 (en) * 2014-04-22 2016-12-08 Neoperl Gmbh Pressure relief valve
US20170020526A1 (en) * 2015-07-22 2017-01-26 Covidien Lp Loading unit locking band for surgical stapling instrument
US9557059B2 (en) 2011-12-15 2017-01-31 Honeywell International Inc Gas valve with communication link
US9562617B2 (en) 2009-07-31 2017-02-07 Mertik Maxitrol Gmbh & Co. Kg Gas flow monitor
JP2017509841A (en) * 2014-01-29 2017-04-06 ロホ、インコーポレイテッド Outflow control valve
US9645584B2 (en) 2014-09-17 2017-05-09 Honeywell International Inc. Gas valve with electronic health monitoring
US9683674B2 (en) 2013-10-29 2017-06-20 Honeywell Technologies Sarl Regulating device
US9835265B2 (en) 2011-12-15 2017-12-05 Honeywell International Inc. Valve with actuator diagnostics
US9841122B2 (en) 2014-09-09 2017-12-12 Honeywell International Inc. Gas valve with electronic valve proving system
US9846440B2 (en) 2011-12-15 2017-12-19 Honeywell International Inc. Valve controller configured to estimate fuel comsumption
US9851103B2 (en) 2011-12-15 2017-12-26 Honeywell International Inc. Gas valve with overpressure diagnostics
US9995486B2 (en) 2011-12-15 2018-06-12 Honeywell International Inc. Gas valve with high/low gas pressure detection
US10024439B2 (en) 2013-12-16 2018-07-17 Honeywell International Inc. Valve over-travel mechanism
US10422531B2 (en) 2012-09-15 2019-09-24 Honeywell International Inc. System and approach for controlling a combustion chamber

Citations (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL80781C (en) *
US501437A (en) * 1893-07-11 Steam or gas regulator
GB191423012A (en) * 1913-11-25 1915-08-12 Germain Frederic Picot Improvements in Safety Devices for Fluid Conveying Pipes.
US1510418A (en) * 1923-05-16 1924-09-30 Seeley Clarence Pressure-regulating gas valve
US2223944A (en) * 1937-03-26 1940-12-03 Albert E Roy Check valve
GB556863A (en) * 1941-05-16 1943-10-26 Acrotorque Co Improvements relating to automatic shut-off valves
FR74260E (en) * 1958-10-08 1960-11-07 Cie De Pont A Mousson Flow control and pressure
US2996077A (en) * 1958-05-08 1961-08-15 Norman S Blodgett Check valve
FR1409416A (en) * 1964-07-16 1965-08-27 Tech D Etudes Et Fournitures I Connection valve flow restrictor
US3406715A (en) * 1965-10-04 1968-10-22 Rain Jet Corp Drain valve
DE1600685A1 (en) * 1967-05-24 1970-01-08 Auto Union Gmbh Rueckschlagventilanordnung
US3661175A (en) * 1970-05-25 1972-05-09 Marotta Scientific Controls Contamination resistant fluid flow fuse
US3709255A (en) * 1971-02-12 1973-01-09 Auto Anti Pollution Devices Of High pressure valves
US3719401A (en) * 1971-04-28 1973-03-06 Fiat Spa Solenoid-operated hydraulic switching valve
US3735777A (en) * 1971-01-28 1973-05-29 Kupex Ag Automatic valve
US3794077A (en) * 1972-12-15 1974-02-26 C Fanshier Excess flow check valve
FR2299186A1 (en) * 1975-01-30 1976-08-27 Bosch Gmbh Robert Pressure control valve for headlamp or windscreen washer - with valve element inside jet body for simple fitting
US4009729A (en) * 1975-10-20 1977-03-01 Dempco, Inc. Hydraulic coupler
US4105044A (en) * 1976-11-15 1978-08-08 Ward Aero, Inc. Flow check valve with bias spring removal capability
US4178958A (en) * 1977-03-15 1979-12-18 Societe Anonyme Des Etablissements Staubli Non-return devices for welding installations
GB2038989A (en) * 1978-12-19 1980-07-30 Nissin Kogyo Kk Onepiece flexible conduit
US4223692A (en) * 1977-10-19 1980-09-23 Perry Landis H Recreational vehicle safety system
JPS55139571A (en) * 1979-04-16 1980-10-31 Gasutotsupu Kogyo Kk Device for separating ball valve from valve seat of excessive outflow prevention valve unit in cock by turning open/close handle to open said ball valve and restore it into reusable state
DE2924533A1 (en) * 1979-06-19 1981-01-08 Gok Gmbh & Co Kg Hose fracture safety device - has plug with round guide ring joined by radial ribs to sealing head
US4269223A (en) * 1980-04-14 1981-05-26 The Aro Corporation Resettable pneumatic overrun control valve
GB2101702A (en) * 1981-06-03 1983-01-19 Jidosha Kiki Co Mounted check valve assembly
JPS59166773A (en) * 1983-03-14 1984-09-20 Nichidoku Kogyo Kk Excessive-flow preventing valve
US4564483A (en) * 1983-11-10 1986-01-14 Cadbury Schweppes, Plc Method and apparatus for batch carbonating
DE8705359U1 (en) * 1987-04-10 1987-08-27 F + H Schweisstechnische Sicherheitsgeraete Gmbh, 5466 Neustadt, De
US4727903A (en) * 1987-06-26 1988-03-01 Malcolm B. Sturgis Fluid shutoff valve
DE8815392U1 (en) * 1988-12-10 1989-03-30 Schmalz, Kurt, Dr., 7296 Glatten, De
US4830046A (en) * 1988-04-22 1989-05-16 Hose Specialties/Capri, Inc. Excess flow control valve
EP0268520B1 (en) * 1986-11-06 1990-01-10 Automobiles Peugeot Check valve for a pressure fluid circuit in a combustion engine
US4955407A (en) * 1988-03-08 1990-09-11 Jidosha Kiki Co., Ltd. Check valve insertable into a hose
US5293898A (en) * 1990-07-06 1994-03-15 Pipelife Rohrsysteme Gesellschaft M.B.H. Safety cut-out

Patent Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL80781C (en) *
US501437A (en) * 1893-07-11 Steam or gas regulator
GB191423012A (en) * 1913-11-25 1915-08-12 Germain Frederic Picot Improvements in Safety Devices for Fluid Conveying Pipes.
US1510418A (en) * 1923-05-16 1924-09-30 Seeley Clarence Pressure-regulating gas valve
US2223944A (en) * 1937-03-26 1940-12-03 Albert E Roy Check valve
GB556863A (en) * 1941-05-16 1943-10-26 Acrotorque Co Improvements relating to automatic shut-off valves
US2996077A (en) * 1958-05-08 1961-08-15 Norman S Blodgett Check valve
FR74260E (en) * 1958-10-08 1960-11-07 Cie De Pont A Mousson Flow control and pressure
FR1409416A (en) * 1964-07-16 1965-08-27 Tech D Etudes Et Fournitures I Connection valve flow restrictor
US3406715A (en) * 1965-10-04 1968-10-22 Rain Jet Corp Drain valve
DE1600685A1 (en) * 1967-05-24 1970-01-08 Auto Union Gmbh Rueckschlagventilanordnung
US3661175A (en) * 1970-05-25 1972-05-09 Marotta Scientific Controls Contamination resistant fluid flow fuse
US3735777A (en) * 1971-01-28 1973-05-29 Kupex Ag Automatic valve
US3709255A (en) * 1971-02-12 1973-01-09 Auto Anti Pollution Devices Of High pressure valves
US3719401A (en) * 1971-04-28 1973-03-06 Fiat Spa Solenoid-operated hydraulic switching valve
US3794077A (en) * 1972-12-15 1974-02-26 C Fanshier Excess flow check valve
FR2299186A1 (en) * 1975-01-30 1976-08-27 Bosch Gmbh Robert Pressure control valve for headlamp or windscreen washer - with valve element inside jet body for simple fitting
US4009729A (en) * 1975-10-20 1977-03-01 Dempco, Inc. Hydraulic coupler
US4105044A (en) * 1976-11-15 1978-08-08 Ward Aero, Inc. Flow check valve with bias spring removal capability
US4178958A (en) * 1977-03-15 1979-12-18 Societe Anonyme Des Etablissements Staubli Non-return devices for welding installations
US4223692A (en) * 1977-10-19 1980-09-23 Perry Landis H Recreational vehicle safety system
GB2038989A (en) * 1978-12-19 1980-07-30 Nissin Kogyo Kk Onepiece flexible conduit
US4295412A (en) * 1978-12-19 1981-10-20 Nissin Kogyo Kabushiki Kaisha Hose with a one-way valve for a vacuum operated servomotor
JPS55139571A (en) * 1979-04-16 1980-10-31 Gasutotsupu Kogyo Kk Device for separating ball valve from valve seat of excessive outflow prevention valve unit in cock by turning open/close handle to open said ball valve and restore it into reusable state
DE2924533A1 (en) * 1979-06-19 1981-01-08 Gok Gmbh & Co Kg Hose fracture safety device - has plug with round guide ring joined by radial ribs to sealing head
US4269223A (en) * 1980-04-14 1981-05-26 The Aro Corporation Resettable pneumatic overrun control valve
GB2101702A (en) * 1981-06-03 1983-01-19 Jidosha Kiki Co Mounted check valve assembly
JPS59166773A (en) * 1983-03-14 1984-09-20 Nichidoku Kogyo Kk Excessive-flow preventing valve
US4564483A (en) * 1983-11-10 1986-01-14 Cadbury Schweppes, Plc Method and apparatus for batch carbonating
EP0268520B1 (en) * 1986-11-06 1990-01-10 Automobiles Peugeot Check valve for a pressure fluid circuit in a combustion engine
DE8705359U1 (en) * 1987-04-10 1987-08-27 F + H Schweisstechnische Sicherheitsgeraete Gmbh, 5466 Neustadt, De
US4727903A (en) * 1987-06-26 1988-03-01 Malcolm B. Sturgis Fluid shutoff valve
US4955407A (en) * 1988-03-08 1990-09-11 Jidosha Kiki Co., Ltd. Check valve insertable into a hose
US4830046A (en) * 1988-04-22 1989-05-16 Hose Specialties/Capri, Inc. Excess flow control valve
DE8815392U1 (en) * 1988-12-10 1989-03-30 Schmalz, Kurt, Dr., 7296 Glatten, De
US5293898A (en) * 1990-07-06 1994-03-15 Pipelife Rohrsysteme Gesellschaft M.B.H. Safety cut-out

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040060601A1 (en) * 2000-06-21 2004-04-01 Mannesmann Vdo Ag Valve for a fuel delivery unit
US6874532B2 (en) 2000-06-21 2005-04-05 Mannesmann Vdo Ag Valve for a fuel delivery unit
US6640831B2 (en) 2000-06-21 2003-11-04 Mannesmann Vdo Ag Valve for a fuel delivery unit
DE10030609A1 (en) * 2000-06-21 2002-01-03 Mannesmann Vdo Ag Valve for a fuel delivery unit
US6408870B1 (en) 2001-08-31 2002-06-25 Research By Copperhead Hill, Inc. Flow control valve
US6644345B2 (en) * 2001-08-31 2003-11-11 Research By Copperhead Hill, Inc. Flow control valve
EP1314921A2 (en) * 2001-11-23 2003-05-28 Voss Fluid GmbH + Co. KG Pipe-fracture valve
EP1314921A3 (en) * 2001-11-23 2003-11-12 Voss Fluid GmbH + Co. KG Pipe-fracture valve
US20040074542A1 (en) * 2002-07-31 2004-04-22 Umac Inc. Excessive flow valve
US6814101B2 (en) * 2002-07-31 2004-11-09 Umac Inc. Excessive flow valve
US6923206B2 (en) 2002-10-28 2005-08-02 Brass Craft Manufacturing Company Excess flow valve with magnet
US20040079911A1 (en) * 2002-10-28 2004-04-29 Glover Donald S. Excess flow valve with magnet
US20100012202A1 (en) * 2007-03-02 2010-01-21 Fischer Norbert Gas flow monitor
US8430121B2 (en) 2007-03-02 2013-04-30 Mertik Maxitrol Gmbh & Co. Kg Gas flow monitor
US20110023983A1 (en) * 2008-03-11 2011-02-03 Norbert Fischer Gas flow monitor
US8662101B2 (en) 2009-05-12 2014-03-04 Mertik Maxitrol Gmbh & Co. Kg Device for inserting a shut-off device in a pipeline
US9562617B2 (en) 2009-07-31 2017-02-07 Mertik Maxitrol Gmbh & Co. Kg Gas flow monitor
US9557059B2 (en) 2011-12-15 2017-01-31 Honeywell International Inc Gas valve with communication link
US8905063B2 (en) 2011-12-15 2014-12-09 Honeywell International Inc. Gas valve with fuel rate monitor
US8947242B2 (en) 2011-12-15 2015-02-03 Honeywell International Inc. Gas valve with valve leakage test
US9074770B2 (en) 2011-12-15 2015-07-07 Honeywell International Inc. Gas valve with electronic valve proving system
US9995486B2 (en) 2011-12-15 2018-06-12 Honeywell International Inc. Gas valve with high/low gas pressure detection
US8839815B2 (en) 2011-12-15 2014-09-23 Honeywell International Inc. Gas valve with electronic cycle counter
US9851103B2 (en) 2011-12-15 2017-12-26 Honeywell International Inc. Gas valve with overpressure diagnostics
US9846440B2 (en) 2011-12-15 2017-12-19 Honeywell International Inc. Valve controller configured to estimate fuel comsumption
US9835265B2 (en) 2011-12-15 2017-12-05 Honeywell International Inc. Valve with actuator diagnostics
US8899264B2 (en) 2011-12-15 2014-12-02 Honeywell International Inc. Gas valve with electronic proof of closure system
US10422531B2 (en) 2012-09-15 2019-09-24 Honeywell International Inc. System and approach for controlling a combustion chamber
US9657946B2 (en) 2012-09-15 2017-05-23 Honeywell International Inc. Burner control system
US9234661B2 (en) 2012-09-15 2016-01-12 Honeywell International Inc. Burner control system
US20160176285A1 (en) * 2013-08-05 2016-06-23 Eaton Corporation Fuel tank check valve
US9914353B2 (en) * 2013-08-05 2018-03-13 Eaton Corporation Fuel tank check valve
US10215291B2 (en) 2013-10-29 2019-02-26 Honeywell International Inc. Regulating device
US9683674B2 (en) 2013-10-29 2017-06-20 Honeywell Technologies Sarl Regulating device
CN105526445A (en) * 2013-10-29 2016-04-27 南安市丽迪家居用品有限公司 Connector
US10024439B2 (en) 2013-12-16 2018-07-17 Honeywell International Inc. Valve over-travel mechanism
JP2017509841A (en) * 2014-01-29 2017-04-06 ロホ、インコーポレイテッド Outflow control valve
US10296019B2 (en) * 2014-04-22 2019-05-21 Neoperl Gmbh Pressure relief vavle
US20160357198A1 (en) * 2014-04-22 2016-12-08 Neoperl Gmbh Pressure relief valve
US9841122B2 (en) 2014-09-09 2017-12-12 Honeywell International Inc. Gas valve with electronic valve proving system
US9645584B2 (en) 2014-09-17 2017-05-09 Honeywell International Inc. Gas valve with electronic health monitoring
US10203049B2 (en) 2014-09-17 2019-02-12 Honeywell International Inc. Gas valve with electronic health monitoring
US10117655B2 (en) * 2015-07-22 2018-11-06 Covidien Lp Loading unit locking band for surgical stapling instrument
US20170020526A1 (en) * 2015-07-22 2017-01-26 Covidien Lp Loading unit locking band for surgical stapling instrument

Also Published As

Publication number Publication date
KR960700427A (en) 1996-01-20

Similar Documents

Publication Publication Date Title
US3561471A (en) Safety valve
US3601152A (en) Unidirectional flow valve
US3420493A (en) Combination metering,check and shut-off valve
US3085589A (en) Safety valve
US5360036A (en) Vented ball valve with lock-out ring
CA2065384C (en) Safety cut-out
US4129145A (en) Check valve assembly
US5462081A (en) Excess flow valve
US20040221893A1 (en) Excess flow shutoff
US4919167A (en) Check valve
US6374852B1 (en) Leak arresting valve
US5613518A (en) Device for restricting excess flow
US3794077A (en) Excess flow check valve
JP3215923B2 (en) Equipment adapter of the refrigeration apparatus
US3894718A (en) Ball valve
US7178785B2 (en) Stem arrangement for pivot actuated sleeve valve
US7225830B1 (en) Fluid control valve
FI107639B (en) a combination of a rotary fluid control valve and silencer
US3378026A (en) Lubricated valve with means to relieve excessive sealant pressure
US3426797A (en) Multiple orifice valve
US3467357A (en) High pressure valve
US3979105A (en) Valve with improved flow passage
US2966371A (en) Longitudinally yieldable coupling
US3154106A (en) Pipeline plugger
US5704391A (en) Gravity-operated gas shut-off valve

Legal Events

Date Code Title Description
FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Expired due to failure to pay maintenance fee

Effective date: 20060526